Behavior of SU surface
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Some times when I create freehand closed loop of edges, the surface fail to form with in it. Or, once I erase the surface, closed loop of edges remains but there seems to be no function to recreate that surface. How do you fill in closed loop edges with surface?
Also I found by accident while making detailed form using Push / Pull tool some surface turned deep blue color. I took that surface with different color is reversed. And found the menu to reveres it. How is SU dealing with front and back of surface? Does it matter which side faces outside of object? Can you not paint the back surface?
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To close a loop all you need to do is draw an edge across the middle of the loop, if this doesnt work thne one or more of the edges ae not planar and youll need to find which they are and then redo them.
As for reversed faces, they dont really matter in SU, but if you ever start rendering your models you need to make sure your model shows only fron faces, as a lot of render applications dont like reversed faces, for whatever reason. Its just good practice really.
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Thanks, drawing across forms the surface. In one case where I had a problem one of the point was out of plane. I don’t know how it got there. But I know now what to look for now.
but if you ever start rendering….
I take it that SU don’t have good render engine? And, you need to export SU geometry for render? That is more photo real render. -
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ridix,
Generally speaking the lighter color is an outside surface. The darker blue color is an inside surface. When you use the Push/Pull tool it may end up turning an object inside out. If, for example, you start with a cube, then draw a rectangle on the face and push it all the way through, what comes out the other side is the reversed "skin" forming the protruded rectangle. You can use the context menu (right click) to reverse color.
As for making surfaces, any time you enclose three points with a line you will create a surface (one exception is if the surface dimension(s) are too small, SketchUp doesn't do well with very small objects). If that surface is on the same plane as other surrounding points it will also fill in that part of the surface. If it does not you can be sure those points are not on the same plane (previous exception excepted).
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(one exception is if the surface dimension(s) are too small,
This mall dimension comment comes up time to time. How small: 1/32”, 1mm? Can you use SU to make a model of a mechanical part at 1/1000th of an inch?
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Generally SU doesnt do faces smaller than about 1mm, although you can easily work around this if you want to do small things, by creating your model at 10,000x the scale and then scaling it down.
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